Table 2

Predicted daily rates of ER visits and the relative risks associated with the volcanic activity

Age groups
 Males
 Females



estimate
 LCI
 UCI
 estimate
 LCI
 UCI
Daily ratesa







0–4
 0.104
 0.099
 0.110
 0.080
 0.076
 0.086

5–9
 0.027
 0.024
 0.030
 0.020
 0.018
 0.023

10–15
 0.007
 0.006
 0.009
 0.007
 0.005
 0.008

all
 0.043
 0.041
 0.045
 0.040
 0.039
 0.042
Relative Risksb






Fumarolic activity period – Period 1





0–4
 2.008
 1.610
 2.504
 1.953
 1.509
 2.527

5–9
 1.698
 1.075
 2.681
 1.358
 0.746
 2.472

10–15
 1.180
 0.438
 3.180
 1.681
 0.690
 4.098

all
 1.927
 1.587
 2.339
 1.799
 1.458
 2.220
One week post eruption – Period 2





0–4
 2.212
 1.791
 2.732
 2.156
 1.685
 2.758

5–9
 1.331
 0.797
 2.222
 1.106
 0.571
 2.140

10–15
 2.102
 0.987
 4.476
 0.996
 0.318
 3.121

all
 1.965
 1.621
 2.381
 1.799
 1.458
 2.220
Two weeks post eruption – Period 3





0–4
 1.995
 1.699
 2.344
 2.280
 1.913
 2.718

5–9
 1.434
 1.004
 2.048
 1.108
 0.691
 1.777

10–15
 1.820
 1.013
 3.270
 0.488
 0.156
 1.530

all
 1.795
 1.552
 2.076
 1.894
 1.632
 2.199
Three weeks post eruption – Period 4





0–4
 2.056
 1.799
 2.350
 2.096
 1.798
 2.442

5–9
 1.579
 1.188
 2.100
 1.067
 0.717
 1.586

10–15
 1.625
 0.972
 2.716
 0.879
 0.431
 1.790

all
 1.891
 1.678
 2.130
 1.807
 1.591
 2.052

aestimated baseline together with 95% confidence interval (LCI, UCI) for cases per day per 1000 served population before and after volcanic eruption.

b relative risks together with 95% confidence interval (LCI, UCI) for cases per day per 1000 served population for effects of the day of the week, official holidays and weekly precipitation.

Naumova et al. Environmental Health 2007 6:21   doi:10.1186/1476-069X-6-21